Abstract:
Flow interference between two circular
cylinders, with same diameter D, in tandem
arrangement is investigated numerically using a
fully coupled resolution method. Numerical
simulations are performed for Reynolds number
Re=200, with centre-to-centre cylinder distance L
varying from 1.5 to 10D. The two-dimensional
Navier-Stokes equations are written in integral form
and discretized by the finite volume method for
unstructured grids. Equations are solved using an
original fully coupled resolution method, without
any transformation of continuity equation, that
allows obtaining simultaneously velocity and
pressure fields. Results analysis shows that change
in flow topology occurs at L=4D and manifests by a
large jump on mean and fluctuating forces and
Strouhal number. Similar trend is observed for
present results at Re=200 and that obtained in a
previous study at Re=100. It is show that maximum
lift force is reached when vortex shedding of the
two cylinders is in-phase and that forces acting on
each cylinder are influenced by the phase lag of
fluctuating lift between the two cylinders.
